The paper evaluates the performance of three WRF Single-Moment 6-Class Microphysics Schemes (WSM3, WSM5, and WSM6) in simulating heavy rainfall over Korea. The study uses both an idealized thunderstorm experiment and a real heavy rainfall case. The idealized experiment is conducted at a horizontal resolution of 250 m for 1 hour, while the real case involves a nested 3-domain simulation at 45 km, 15 km, and 5 km grid sizes for 24 hours. The results show that while the basic features of the simulated storms remain similar across the WSMMPs, the WSM6 scheme exhibits a wider rain shaft compared to WSM3 and WSM5. In the real case, WSM6 shows better pattern correlation and shifts the major precipitation band southward, aligning more closely with observations. Sensitivity experiments indicate that the differences in precipitation are primarily due to the revised ice microphysical processes in WSM6, rather than differences in the terminal velocity of graupel. The study concludes that the complexity of microphysics in terms of the number of prognostic water substances has a smaller impact on simulated convective activity compared to the formulation of each microphysical process within the same category.The paper evaluates the performance of three WRF Single-Moment 6-Class Microphysics Schemes (WSM3, WSM5, and WSM6) in simulating heavy rainfall over Korea. The study uses both an idealized thunderstorm experiment and a real heavy rainfall case. The idealized experiment is conducted at a horizontal resolution of 250 m for 1 hour, while the real case involves a nested 3-domain simulation at 45 km, 15 km, and 5 km grid sizes for 24 hours. The results show that while the basic features of the simulated storms remain similar across the WSMMPs, the WSM6 scheme exhibits a wider rain shaft compared to WSM3 and WSM5. In the real case, WSM6 shows better pattern correlation and shifts the major precipitation band southward, aligning more closely with observations. Sensitivity experiments indicate that the differences in precipitation are primarily due to the revised ice microphysical processes in WSM6, rather than differences in the terminal velocity of graupel. The study concludes that the complexity of microphysics in terms of the number of prognostic water substances has a smaller impact on simulated convective activity compared to the formulation of each microphysical process within the same category.